added hourSelection function, resolves #363

content/v2.0/reference/flux/functions/built-in/transformations/hourselection.md

@@ -0,0 +1,53 @@
+---
+title: hourSelection() function
+description: >
+  The `hourSelection()` function retains all rows with time values in a specified hour range.
+  Hours are specified in military time.
+aliases:
+  - /v2.0/reference/flux/functions/transformations/hourSelection
+menu:
+  v2_0_ref:
+    name: hourSelection
+    parent: built-in-transformations
+weight: 401
+---
+
+The `hourSelection()` function retains all rows with time values in a specified hour range.
+
+_**Function type:** Transformation_  
+
+```js
+hourSelection(
+  start: 9,
+  stop: 15,
+  timeColumn: "_time"
+)
+```
+
+## Parameters
+
+### start
+The first hour of the hour range (inclusive).
+Hours range from `[0-23]`.
+
+_**Data type:** Integer_
+
+### stop
+The last hour of the hour range (inclusive).
+Hours range from `[0-23]`.
+
+_**Data type:** Integer_
+
+### timeColumn
+The column that contains the time value.
+Default is `"_time"`.
+
+_**Data type:** String_
+
+## Examples
+```js
+from(bucket:"example-bucket")
+  |> range(start:-90d)
+  |> filter(fn: (r) => r._measurement == "foot-traffic" )
+  |> hourSelection(start: 9, stop: 17)
+```